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PageView (from Apple Tutorials)
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//Adapted from the Apple tutorial project files here: https://developer.apple.com/tutorials/swiftui/creating-a-watchos-app | |
import SwiftUI | |
import UIKit | |
struct ContentView: View { | |
var body: some View { | |
PageView([ExamplePage(number: 0), ExamplePage(number: 1), ExamplePage(number: 2)]) | |
.aspectRatio(3 / 2, contentMode: .fit) | |
.frame(maxWidth: .infinity) | |
} | |
} | |
struct ExamplePage: View { | |
let number: Int | |
var body: some View { | |
Text("This is page \(number)") | |
.frame(maxWidth: .infinity, maxHeight: .infinity) | |
.background(Color.red) | |
} | |
} | |
struct PageView<Page: View>: View { | |
var viewControllers: [UIHostingController<Page>] | |
@State var currentPage = 0 | |
init(_ views: [Page]) { | |
self.viewControllers = views.map { UIHostingController(rootView: $0) } | |
} | |
var body: some View { | |
ZStack(alignment: .bottomTrailing) { | |
PageViewController(controllers: viewControllers, currentPage: $currentPage) | |
PageControl(numberOfPages: viewControllers.count, currentPage: $currentPage) | |
.padding(.trailing) | |
} | |
} | |
} | |
struct PageViewController: UIViewControllerRepresentable { | |
var controllers: [UIViewController] | |
@Binding var currentPage: Int | |
func makeCoordinator() -> Coordinator { | |
Coordinator(self) | |
} | |
func makeUIViewController(context: Context) -> UIPageViewController { | |
let pageViewController = UIPageViewController( | |
transitionStyle: .scroll, | |
navigationOrientation: .horizontal) | |
pageViewController.dataSource = context.coordinator | |
pageViewController.delegate = context.coordinator | |
return pageViewController | |
} | |
func updateUIViewController(_ pageViewController: UIPageViewController, context: Context) { | |
pageViewController.setViewControllers( | |
[controllers[currentPage]], direction: .forward, animated: true) | |
} | |
class Coordinator: NSObject, UIPageViewControllerDataSource, UIPageViewControllerDelegate { | |
var parent: PageViewController | |
init(_ pageViewController: PageViewController) { | |
self.parent = pageViewController | |
} | |
func pageViewController( | |
_ pageViewController: UIPageViewController, | |
viewControllerBefore viewController: UIViewController) -> UIViewController? { | |
guard let index = parent.controllers.firstIndex(of: viewController) else { | |
return nil | |
} | |
if index == 0 { | |
return parent.controllers.last | |
} | |
return parent.controllers[index - 1] | |
} | |
func pageViewController( | |
_ pageViewController: UIPageViewController, | |
viewControllerAfter viewController: UIViewController) -> UIViewController? { | |
guard let index = parent.controllers.firstIndex(of: viewController) else { | |
return nil | |
} | |
if index + 1 == parent.controllers.count { | |
return parent.controllers.first | |
} | |
return parent.controllers[index + 1] | |
} | |
func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) { | |
if completed, | |
let visibleViewController = pageViewController.viewControllers?.first, | |
let index = parent.controllers.firstIndex(of: visibleViewController) { | |
parent.currentPage = index | |
} | |
} | |
} | |
} | |
struct PageControl: UIViewRepresentable { | |
var numberOfPages: Int | |
@Binding var currentPage: Int | |
func makeCoordinator() -> Coordinator { | |
Coordinator(self) | |
} | |
func makeUIView(context: Context) -> UIPageControl { | |
let control = UIPageControl() | |
control.numberOfPages = numberOfPages | |
control.addTarget( | |
context.coordinator, | |
action: #selector(Coordinator.updateCurrentPage(sender:)), | |
for: .valueChanged) | |
return control | |
} | |
func updateUIView(_ uiView: UIPageControl, context: Context) { | |
uiView.currentPage = currentPage | |
} | |
class Coordinator: NSObject { | |
var control: PageControl | |
init(_ control: PageControl) { | |
self.control = control | |
} | |
@objc | |
func updateCurrentPage(sender: UIPageControl) { | |
control.currentPage = sender.currentPage | |
} | |
} | |
} |
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